As the only other known user of Ryusoken, Robin's training under Sabo proved to be crucial in her fight against Black Maria of the Tobi Roppo during the Raid on Onigashima at the climax of the Wano Arc.

Source: https://gamerant.com/one-piece-sabos-ryusoken-explained/

The First Mate of the Kid Pirates, Killer took both Kaido AND Big Mom during the Clash of the Monsters on Onigashima.

Source: https://www.themarysue.com/worst-generation-one-piece-all-12-members-ranked-worst-to-best/

The raid on Onigashima saw various betrayals and alliances, with Luffy defeating Kaido and the alliance achieving a comprehensive victory, disbanding afterwards.

Source: https://gamerant.com/one-piece-the-ninja-pirate-mink-samurai-alliance-explained/

This shows that even during his many intense battles against Luffy, the rest of the Worst Generation, and Yamato, a portion of his power and focus was split to carry and direct Onigashima to the flower capital.

Source: https://gamerant.com/one-piece-ways-kaido-lived-up-to-reputation-in-wano/